Their impact is low compared even to Treetop Village and the cost of playing them is certainly not negligible
Many of its cards allow you to buff your characters, so they can "swing up" and make favorable trades with your opponent's more expensive cards
It current price is around $0.11
Prince Phillip Warden of the Woods 88/204 Hero-themed decks look really exciting this deck, and Prince Phillip grants a pretty powerful Ward ability to all heroes in play, making it pretty hard for you opponent to easily take them out
(If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.) If Maester Seymour is no longer on the battlefield when its first ability resolves, use its power as it last existed on the battlefield to determine how many +1/+1 counters to put on the target creature
I definitely think that this set brings a lot of interesting cards to the game and I can tell that this was a labor of love from the folks at Wizards of the Coast who worked on the set